[Tile-serving] [osm2pgsql] Update ax_lua.m4 (#282)

[Tom Hughes]

Configures OK on Fedora 21:

```
checking for a Lua interpreter with version >= 5.0... lua
checking for lua... /usr/bin/lua
checking for lua version... 5.2
checking for lua platform... unknown
checking for lua script directory... ${prefix}/share/lua/5.2
checking for lua module directory... ${exec_prefix}/lib/lua/5.2
checking if LUA_VERSION is defined... yes
checking lua.h usability... yes
checking lua.h presence... yes
checking for lua.h... yes
checking lualib.h usability... yes
checking lualib.h presence... yes
checking for lualib.h... yes
checking lauxlib.h usability... yes
checking lauxlib.h presence... yes
checking for lauxlib.h... yes
checking luaconf.h usability... yes
checking luaconf.h presence... yes
checking for luaconf.h... yes
checking for Lua header version... 5.2
checking if Lua header version matches 5.2... yes
checking if LUA_VERSION is defined... yes
checking for library containing exp... -lm
checking for library containing dlopen... -ldl
checking for library containing lua_load... -llua-5.2
```

Build is failing, but that seems to be a protobuf issue, not lua.

---
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